nbd: move the task_recv check into nbd_size_update

nbd_size_update is about to acquire a few more callers, so lift the check
into the function.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NJosef Bacik <josef@toxicpanda.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

drivers/block/nbd.c

@@ -299,8 +299,11 @@ static void nbd_size_clear(struct nbd_device *nbd)
 static void nbd_size_update(struct nbd_device *nbd)
 {
 	struct nbd_config *config = nbd->config;
-	struct block_device *bdev = bdget_disk(nbd->disk, 0);
 	sector_t nr_sectors = config->bytesize >> 9;
+	struct block_device *bdev;
+
+	if (!nbd->task_recv)
+		return;
 
 	if (config->flags & NBD_FLAG_SEND_TRIM) {
 		nbd->disk->queue->limits.discard_granularity = config->blksize;
@@ -309,7 +312,9 @@ static void nbd_size_update(struct nbd_device *nbd)
 	}
 	blk_queue_logical_block_size(nbd->disk->queue, config->blksize);
 	blk_queue_physical_block_size(nbd->disk->queue, config->blksize);
+
 	set_capacity(nbd->disk, nr_sectors);
+	bdev = bdget_disk(nbd->disk, 0);
 	if (bdev) {
 		if (bdev->bd_disk)
 			bd_set_nr_sectors(bdev, nr_sectors);
@@ -326,8 +331,7 @@ static void nbd_size_set(struct nbd_device *nbd, loff_t blocksize,
 	struct nbd_config *config = nbd->config;
 	config->blksize = blocksize;
 	config->bytesize = blocksize * nr_blocks;
-	if (nbd->task_recv != NULL)
-		nbd_size_update(nbd);
+	nbd_size_update(nbd);
 }
 
 static void nbd_complete_rq(struct request *req)